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首页> 外文期刊>International Journal of Electrochemical Science >The Study of a Phosphate Conversion Coating on Magnesium Alloy AZ91D: IV. Comparison of Electrochemical Behaviors in Borate Buffer and Sodium Chloride Solutions
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The Study of a Phosphate Conversion Coating on Magnesium Alloy AZ91D: IV. Comparison of Electrochemical Behaviors in Borate Buffer and Sodium Chloride Solutions

机译：镁合金AZ91D上的磷酸盐转化膜的研究IV。在硼酸盐缓冲液和氯化钠溶液中的电化学行为比较

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This paper involved a phosphate conversion coating on magnesium alloy AZ91D. The phosphatedmagnesium alloy (PMA) was obtained via the preparation of phosphate conversion coating (PCC) onthe surface of uncoated magnesium alloy (UMA). The electrochemical behaviors of PMA and UMA inthe borate buffer (H 3 BO 4 ) solution and in the sodium chloride (NaCl) solution were characterized withthe electrochemical techniques of potentiodynamic polarization and electrochemical impedancespectroscopy (EIS), and the results were also compared. Both in the H 3 BO 4 solution and in the NaClsolution, the corrosion current density (i corr ) and the total impedance (Z all-in ) of PMA were respectivelysmaller and larger than those of UMA, indicating the protective performance of PCC. However, thedeviations of electrochemical parameters in the H 3 BO 4 solution were significantly lower than those inthe NaCl solution, which was due to the relatively stable pH value of H 3 BO 4 solution, confirming therationality of borate buffer solutions for the electrochemical measurements concerning magnesiumalloys.
机译：本文涉及镁合金AZ91D上的磷酸盐转化膜。通过在未涂覆的镁合金（UMA）的表面上制备磷酸盐转化膜（PCC），获得了磷酸镁合金（PMA）。用电位动力学极化和电化学阻抗谱（EIS）技术表征了PMA和UMA在硼酸盐缓冲液（H 3 BO 4）和氯化钠（NaCl）中的电化学行为，并对结果进行了比较。在H 3 BO 4溶液和NaCl溶液中，PMA的腐蚀电流密度（i corr）和总阻抗（Z all-in）分别比UMA小和大，表明PCC的保护性能。然而，由于H 3 BO 4溶液的pH值相对稳定，H 3 BO 4溶液的电化学参数偏差明显低于NaCl溶液，这证实了硼酸盐缓冲溶液在镁合金电化学测量中的合理性。

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